As cellphone hardware margins dwindle downwards (ask Motorola about this), Nokia has tried to get its revenue diversified beyond just that phone you may have holding in your hand right now (unless you are typing). The world's largest handset maker has said that it will be entering the mobile advertising biz sometime this year with a few new software platforms just for the occasion: "Nokia Ad Service" and "Nokia Advertising Connector." Will Yahoo!, Google, MobAds and other mobile ads companies become a little miffed? Doubtful, but with a customer now being a competitor, who knows. We like the Nokia Advertising Connector best, which lets advertisers target different types of mobile ads to the actual handset model being used.